Mathematics - Multiplication - Multi-digit multiplication - Step-by-Step Multiplier
Show multiplication problems in vertical format. The student fills in partial products step by step. For 2-digit × 1-digit: fill ones product, carry, tens product. For 2-digit × 2-digit: fill first row, second row (shifted), then sum. 10 problems progressing: 5 of (2-digit × 1-digit), 3 of (3-digit